Was looking at doing my cams soon and was going to go with either skunk2 or Brian crower. when I told my friend about it he said he would recommend doing valves and possibly springs as well. Is this necessary? Also he told me that he only recommends doing valves if the stock ones are sodium filled and to switch them to stainless. Just want a second opinion and a bit more info. Are the k24a4 oem valves sodium or stainless and which is better? Also which cams would you recommend between skunk2 and BC? Thanks.